CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 101
·期 7
·4170-4183
·
IF 2.5
Feng Rong,Limin He,Yuling Lü,Ce Wang,Shipeng Wang
Microscopic adhesion of oil droplets is a hot research topic within multiphase flow systems in the petrochemical field in recent years, and it is also the key to revealing the mechanism of oil droplet–wall interaction. In this paper, a high-speed camera was used to capture the dynamic process of oil droplets impacting stainless steel, polyethylene, brass, and other materials in water, deeply analyze the influence mechanism of material wettability, droplet size, and inclination on adhesion behaviour in this process, and draw the Re~ θ eq phase diagram. The experimental results show that properly enhancing the lipophilicity of the material can prolong the drainage time and effectively inhibit adhesion. Too much lipophilicity can dramatically shorten the drainage time instead, which easily leads to the rapid adhesion of oil droplets. An increase in droplet size can also prolong the drainage time; at Re ≥46.31, the excessive initial kinetic energy is consumed in the form of oil droplet rebound, which is not conducive to adhesion, and the more lipophilic the material is, the more significant the rebound effect. In addition, although an increase in the inclination can inhibit oil droplet bounce off, it also decreases the wall restraint to oil droplets, resulting in lateral and normal displacements, which greatly increases the drainage time. The findings can facilitate the understanding of oil droplet–wall interaction and provide a scientific basis for the design and development of efficient separation equipment and the optimization of the low-temperature gathering and transportation of high water-bearing crude oil.
研究领域:
石油工程
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
Soft Matter
·
2025
·
IF 2.8
Jiayu Liu,Yankai Xu,Zihan Qiao,Shanshan Li,Xing Ma,Ting Kuang,H. P. Zhang,Wei Wang
Active colloids powered by self-generated gradients are influenced by nearby solid boundaries, leading to their reorientation. In this study, the tilt angles (the angle between where an active colloid moves and where it faces) were measured to be 13.3° and −33.9° for 5 μm polystyrene microspheres half coated with 10 nm Pt caps moving in 5% H2O2 along the bottom and top glass wall, respectively, indicating that the colloids moved with their PS (forward) caps tilted slightly toward the wall. The speeds and tilt angles of Pt Janus colloids increased consistently with increasing H2O2 concentration (0.5 to 10 v/v%) and Pt cap thickness (5 to 50 nm). We propose that the tilt results from a balance between gravitational torque (caused by the Pt cap's weight) and chemical activity-induced torque (from self-generated chemical gradients), qualitatively supported by finite element simulations based on self-electrophoresis. Our findings are useful for understanding how chemically active colloids move in, and interact with, their environment.
研究领域:
胶体科学
·
物理化学
·
界面现象研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Energy Technology
·
2020
·Vol. 9
·期 2
·2000795
·
IF 3.404
Hao Lu,Shaowei Liang
This study experimentally investigates a method to reduce dust deposition on solar cells using a superhydrophobic coating under various influencing factors. The deposition pattern, deposition density, and reduction of spectral transmittance by dust deposition are investigated. The comparison of the types of dust shows that the dust deposition densities of soil and sand on the coated surface are only 52.6% and 37.2% of those on the uncoated surface, respectively, when the dust is dry and the tilt angle θ is 30°. The comparison of the tilt angles shows that the dust deposition densities on the coated surface are only 37.2% and 22.3% of those on the uncoated surface at θ values of 30° and 60°, respectively, when the dust is dry sand. The comparison of different water contents shows that the dust deposition densities on the coated surface are only 37.2% and 46.3% of those on the bare surfaces for dry sand and wet sand, respectively, when the θ value is 30°. The superhydrophobic coating reduces the deposition of sand dust more than that of soil dust. Moreover, the reduction in dust deposition by the coating is greater with higher tilt angles and with drier dust.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 44
·25875-25879
·
IF 3.049
Jie Lu,Ye Pan,Qifeng Zhong,Bing Liu
A simple method to create guided cellular orientation is illustrated by assembling fibroblasts on the dorsal side of M. menelaus wings. Moreover, by inserting the wing into tendon fibroblasts suspension at a tilt angle, guided cellular orientation concurrently with the cell density gradient is formed on the butterfly wings.
研究领域:
细胞生物学
·
组织工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Coatings
·
2023
·Vol. 13
·期 2
·264
·
IF 3.4
Bo Li,Lei Fan,Jie Bai,Huiying Xiang,Yuan Yuan
The dynamic behaviors of water droplets on a slippery surface are significant to practical anti-icing applications. Herein, the impact and sliding behavior of water droplets on lubricant-infused surfaces (LISs) were investigated with a high-speed camera. LISs were prepared by infusing perfluoropolyether oils into anodized porous surfaces. The results show that the maximum spreading diameter and retraction velocity of the impact droplet increased with theWenumber. For LIS-100, the spreading factor at 2.5 ms increased from 2.00 to 3.88 withWeincreasing from 30 to 267. Low-viscosity lubricant facilitated the retraction speed and rebound of droplet impact on the surface, while high-viscosity lubricant contributed to the lubricant stability of the LIS. Additionally, high inclination angle (θ) facilitated the rapid shedding of water droplets on the surface. The velocity increased rapidly from 1.04 to 4.66 mm/s withθincreasing from 15° to 45°. The LIS prepared with low-viscosity lubricant had a high sliding velocity, and the sliding velocity of water droplets on LIS-100 was about seven times faster than that on LIS-104. This work reveals the impacting law of water droplets on LISs and provides useful information for the design of LISs under drop impact conditions.Keywords:impact behavior;Wenumbers;surface inclinations;slippery surface
研究领域:
材料科学
·
流体力学
✓ 已验证
产品关联
DOI
高影响因子
ACS Biomaterials Science & Engineering
·
2023
·
IF 5.8
Guowei Wang,Chengpan Li,Chunguang Miao,Shibo Li,Bensheng Qiu,Weiping Ding
With the emergence of various cutting-edge micromachining technologies, lab on a chip is growing rapidly, but it is always a challenge to realize the on-chip separation of living cells from cell samples without affecting cell activity and function. Herein, we report a novel on-chip label-free method for sorting living and dead cells by integrating the hypertonic stimulus and tilted-angle standing surface acoustic wave (T-SSAW) technologies. On a self-designed microfluidic chip, the hypertonic stimulus is used to distinguish cells by producing volume differences between living and dead cells, while T-SSAW is used to separate living and dead cells according to the cell volume difference. Under the optimized operation conditions, for the sample containing 50% of living human umbilical vein endothelial cells (HUVECs) and 50% of dead HUVECs treated with paraformaldehyde, the purity of living cells after the first separation can reach approximately 80%, while after the second separation, it can be as high as 93%; furthermore, the purity of living cells after separation increases with the initial proportion of living cells. In addition, the chip we designed is safe for cells and can robustly handle cell samples with different cell types or different causes of cell death. This work provides a new design of a microfluidic chip for label-free sorting of living and dead cells, greatly promoting the multi-functionality of lab on a chip.
研究领域:
微流控技术
·
生物医学工程
·
细胞生物学
·
芯片实验室技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2023
·
IF 2.2
Zhiwen Chen,Xiaoyong Yang,Bingjie Wang,Jian Dai,Zhishan Bai
Plate separators are widely used for oil-water separation in the petrochemical industry. The microscopic adhesion behavior of oil droplets at the solid surface is the key to understanding the oil-water separation mechanism in the plate separator. However, published microscopic experiments and mechanism research is insufficient. This study experimentally investigates the process of oil droplets impacting solid surfaces of Polytetrafluoroethylene (PTFE), 304 stainless steel, and Polyvinyl chloride using a high-speed camera. The influences of solid surfaces with different wettability and inclined angles from 0° to 45° are studied. The results show that oil droplets have the shortest drainage time and the greatest spreading speed on PTFE plates. The drainage time on an inclined surface is significantly longer than on a horizontal plate, and increases as the angle increases. The maximum spreading length occurs at an inclined angle of 15°, and is less affected by the angle as the Weber number (We) decreases. This study facilitates the understanding of oil droplet adhesion on a coalescing material surface in a plate separator from a microscopic view.
研究领域:
化学工程
·
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）